Steam-boiler furnace.



' Patented 1an. 2|, |902.

J. J. LE Duc.

STEAM BUILER FURNAGE.

(Application led July l5, 1901.)

(No Model.)

2 Sheetsv-$heet I.

mi Nouns PETER: cq.. PHooLn'na.. wfaumsms, p. c,

' Patented lan. 2l, |902.

J. J. LE DUC.

STEAM BOILER FUHNACE.

(Applimvign med .my 5, 1901.) l

2 Sheets-Sheet 2.

(No Model.)

VNITED STATES PATENT (")FFICEL` JOHN JAY LE DUO, or KERNs, MINNESOTA.

STEAM-BOILER FU RNACE.

SPECIFICATION forming part of LettersvPatent No. 691,641, dated January 21, 1902.

Application tiled July 5, 1901. Serial No. 67,204. (No model.) i

. To all whom it may concern:

Beit known that I, JOHN JAY LE DUC,a citizen of the United States, residing at Kerns,in the county of Nicollet and State of Minnesota, have invented a new and useful Steam-Boiler Furnace, of which the following is a specification.

This invention relates to steam-boiler furnaces, and has for its object to increase the circulation thereof and to confine the iiames and products of combustion within the lower present invention applied thereto.r

portiony of the fire-box prior to their escape therefrom into the fines, thereby to insure the quick and effective ignition of new fuel introduced through the fire-door. lt is furthermore designed to arrange the present invention in the nature of an attachmentwhich may be readily placed within the fire-box of j a furnace, especially locomotive,traction, and threshing engines,without,altering or changing the same beyond the formation of openings for the connection of the water-pipes.

With these and other objects in View the present invention consists in the`combination and arrangement of parts, as Will'be hereinafter more fully described, shown in the accompanying drawings,and particularly pointed out in the appended claims, it beingunderstood that changes in the form, proportion, size, and minor details may be made within the scope of the claims without departing from the spirit or sacrii'cing any of the advantages of the invention.

In the drawings, Figure l is a vertical longitudinal sectional view of a lire-box and adjacent portion of a steam-boiler having the v Fig. 2 is a transverse sectional view taken on the line 2 2 of Fig. 1. of the water-tube dame-sheet, parts being broken away to illustrate the connection of adjacent water-tubes. Fig. 4 is a detail view illustrating the means for supporting the flame-sheet.

Corresponding parts in all of the figures of the drawings are designated by like characters of reference.

To illustrate the application of the invention, there has been shown in the drawings a portion of al steam-boiler l, having an ordinary iire-boX 2, with the usual inner wall or Fig. 3 is an enlarged plan'viewv I shell 3 to form a water-space surrounding the In the front of the tire-box is the fire-box. usual door 4 for the introduction of fuel, and the grate 5 is located at the back of the tireboX. These parts are common and well known, and therefore may vary in form.

In carrying out the present invention it is designed to provide a baffle-plate or flamesheet which is inclined upwardly and forwardly over the grate, as best shown in Fig. l of the drawings, so as to confine the flames within the lower portion of the fire-box and also direct the saine forwardly and upwardly, as indicated by the arrows, thereby to insure troduced thronghthe door 4. This is especially advantageous when using straw or the like as fuel. This fiance-sheet or `baffleplate is in the nature of a pipe-coil and is formed by means of a plurality of straight substantially parallel pipe sections or tubes 6, which extend transversely across the fire-box and all lie in the same plane, which is inclined upwardly and forwardly from the back of the fire-box and adjacentl to the bottom thereof. The corresponding ends of adjacent tubes are connected by means of a rectangular block-like coupling '7, the inner face of which is provided with a pair of screw-threaded openings for the reception of the'screwthreaded ends of the tubes, as best shown in Fig.` 3, there being an internal longitudinal bowed passage 8 extending between the openings and forming a connecting-passage between the tubes. It will be observed that these couplings have their ends in contact with the'adjacent couplings, thereby spacing the tubes at regular intervals, and'between adjacent tubes there are snugly fitted the fillingbars '9, which brace and stiifen the tubes and also close the spaces between the tubes and form an imperforate baffle-plate or flame-sheet, so that the iiames cannot pass through the plate, but are compelled to pass upwardly across the under side thereof and over the top end, which is terminated shortV a quick and eifective ignition of new fuel inof the front end of the tire-box and below the IOO the fire-box and inclined upwardly7 and forwardly, the end couplings 7 being seated upon the flanges.

To provide for the circulation of water through the water-tube sheet a T- coupling 12 is provided adjacent to one end of the lowermost tube-section and in communication with the water-space at the back of the fireboX, so as to provide for a supply of water to the lower end of the water-tube sheet. The heated water and steam generated thereby pass upwardly through the tube-sheet, as indicated by the arrows in Fig. 3, and finally escape from the upper end through the upright discharge-pipe 13, which rises from the middle of the uppermost tube-section and is projected upwardly through the crown-sheet, as indicated in Figs. 1 and 2, thereby effecting a complete circulation of water and steam from the back of the fire-box, through the same, and then into the water and steam space above the lire-box.

Upon the upper end of the discharge-pipe 13 there is fitted a valve-seat 14., which lies above the lire-box, and 'to this seat there is fitted a cage 15, within which is mounted a vertically-movable valve 16, having a stem 17, that passes upwardly through a guideopening in the top of the cage. This valve is normally held open by means of a weighted lever 18, connected to the valve-stein and fulcrunied intermediate of its ends upon a support 19, rising from the valve-seat, whereby the circulation is unobstructed.

From one end ofthe uppermost tube-section there depends a blow-olf pipe 20, which is provided with a branch pipe 21, leading to any desired point exteriorly of the fire-box and provided with a valve 22,whereby muddy water and sediment may be blown off from the water-tube sheet by merely opening the valve 22, as the back pressure from the boiler will then seat the check-valve 16 so that the only escape from the water-tubes is through the blow-off pipe.

From the foregoing description it is apparent that the present invention may be applied to any ordinary furnace without materially altering or changing the same and when fitted in place forms a baffle-plate to confine the flames within the lower part of the fireboX to insure the ignition of new fuel and to obtain the full effect of the llames upon the water-tube sheet to quickly heat the water therein, and thereby increase the circulation of the water. The present invention is especially designed for use in connection with threshing-machine engines, where the fuel commonly used is straw, and the llames therefrom do not effectually reach the flues in the boiler, and new fuel is imperfectly ignited. By means of the present device the water therein is subjected to the tierce heat of the llames, as the tube-sheet is located directly in the path thereof, and also the flames are directed outwardly toward the door to insure the prompt ignition of the incoming straw.

What is claimed isl. In a steam-boiler furnace, the combination with the lire-box, of a hollow baille-plate located within the fire-box and in communication at opposite ends with the water-space surrounding the lire-box, a check-valve -for one end of the baffle-plate, and a blow-off for said plate.

2. In a steam-boiler furnace, the combination with the tire-box, of a hollow baille-plate located within the fire-box and in communication with the water-space at the back of the lire-box and also with the space above the crown-sheet, a normally open check-valve controlling the communication between the hollow plate and the space above the crownsheet, and a blow-off for the hollow plate.

3. Ina steam-boiler furnace, the combination with the lire-box, of a hollow baffle-plate inclined upwardly and forwardly from `the back of the fire-box, the lower end of the plate being in communication with the water-space at the back of the lire-box, and the upper end of the plate being in communication with the water-space above the crown-sheet, a normally open check-valve controlling the latter communication and located within the space above the crown-sheet, and a valve-controlled blow-olf pipe connected to the upper end of the hollow plate and projected eXteriorly of the lire-box.

i. The combination with a fire-box having a water-space surrou ndin g the same, of a hollow baille-plate located within the fire-box, and having opposite communicating passages with the water-space at the back of the fireboX and above the crown-sheet, respectively, the latter passage having a valve-seat located above the crown-sheet, a cage fitted thereto, a vertically-movable valve mounted within the cage and having an upwardly-projected stem, a weighted lever fulcrumed intermediate of its ends and connected to the valve to normally hold it open, and a blow-olf for the hollow baille-plate.

5. ln a water-tube baffle-plate for fire-boxes, a plurality of tube-sections, couplings for corresponding ends of adjacent tube-sections, opposite inlet and outlet couplings, and Opposite flanged supports, the first mentioned couplings being constructed to lie upon the respective supports.

l5. In a water-tube baille-plate for lire-boxes, a plurality ot' substantially parallel tube-sections, terminal couplings for the corresponding ends of adjacent sections, and opposite flanged supporting-bars, the couplings being constructed to lie upon the flanged portions of the respective bars for the support of the tubes.

i. A hollow baffle-plate for fire-boxes, comprising a plurality of substantially parallel water-tubes, terminal couplings for the corresponding ends of adjacent tubes, and filling-bars having their opposite sides conforming to the contour ot' said tubes and snugly titting the spaces between the tubes, the

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whole forming an imperi'orate baffle-plate having the upper and lower portions of the tubes exposed to the action of heat.

connection between the lowerlnost tube and the water-space at the back of the fire-box, an upstanding discharge-pipe rising from the uppermost pipe and piercing the crown-sheet,

a normally open check-Valve at the upper end of the discharge pipe and above the crownsheet, and a blow-ott pipe leading from the uppermost tube. v

In testimony that I claim the foregoing as my own I have hereto affixed my signatu re in the presence of two witnesses..

JOHN JAY LEDUC.

Witnesses: y

S. B. WILSON, A. H. TURRITTIN. 

